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<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1315065
-->
<head>
  <meta charset="utf-8">
  <title>Test for Bug 1315065</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1315065">Mozilla Bug 1315065</a>
<div contenteditable><p>abc<br></p></div>
<script type="application/javascript">
/** Test for Bug 1315065 **/
SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(()=>{
  var editor = document.getElementsByTagName("div")[0];
  function initForBackspace(aSelectionCollapsedTo /* = 0 ~ 3 */) {
    editor.innerHTML = "<p id='p'>abc<br></p>";
    var p = document.getElementById("p");
    // FYI: We cannot inserting empty text nodes as expected with
    //      Node.appendChild() nor Node.insertBefore(). Therefore, let's use
    //      Range.insertNode() like actual web apps.
    var selection = window.getSelection();
    selection.collapse(p, 1);
    var range = selection.getRangeAt(0);
    var emptyTextNode3 = document.createTextNode("");
    range.insertNode(emptyTextNode3);
    var emptyTextNode2 = document.createTextNode("");
    range.insertNode(emptyTextNode2);
    var emptyTextNode1 = document.createTextNode("");
    range.insertNode(emptyTextNode1);
    is(p.childNodes.length, 5, "Failed to initialize the editor");
    is(p.childNodes.item(1), emptyTextNode1, "1st text node should be emptyTextNode1");
    is(p.childNodes.item(2), emptyTextNode2, "2nd text node should be emptyTextNode2");
    is(p.childNodes.item(3), emptyTextNode3, "3rd text node should be emptyTextNode3");
    switch (aSelectionCollapsedTo) {
      case 0:
        selection.collapse(p.firstChild, 3); // next to 'c'
        break;
      case 1:
        selection.collapse(emptyTextNode1, 0);
        break;
      case 2:
        selection.collapse(emptyTextNode2, 0);
        break;
      case 3:
        selection.collapse(emptyTextNode3, 0);
        break;
      default:
        ok(false, "aSelectionCollapsedTo is illegal value");
    }
  }

  for (var i = 0; i < 4; i++) {
    const kDescription = i == 0 ? "Backspace from immediately after the last character" :
                                  "Backspace from " + i + "th empty text node";
    editor.focus();
    initForBackspace(i);
    synthesizeKey("KEY_Backspace", { code: "Backspace" });
    var p = document.getElementById("p");
    ok(p, kDescription + ": <p> element shouldn't be removed by Backspace key press");
    is(p.tagName.toLowerCase(), "p", kDescription + ": <p> element shouldn't be removed by Backspace key press");
    // When Backspace key is pressed even in empty text nodes, Gecko should not remove empty text nodes for now
    // because we should keep our traditional behavior (same as Edge) for backward compatibility as far as possible.
    // In this case, Chromium removes all empty text nodes, but Edge doesn't remove any empty text nodes.
    is(p.childNodes.length, 5, kDescription + ": <p> should have 5 children after pressing Backspace key");
    is(p.childNodes.item(0).textContent, "ab", kDescription + ": 'c' should be removed by pressing Backspace key");
    is(p.childNodes.item(1).textContent, "", kDescription + ": 1st empty text node should not be removed by pressing Backspace key");
    is(p.childNodes.item(2).textContent, "", kDescription + ": 2nd empty text node should not be removed by pressing Backspace key");
    is(p.childNodes.item(3).textContent, "", kDescription + ": 3rd empty text node should not be removed by pressing Backspace key");
    editor.blur();
  }

  function initForDelete(aSelectionCollapsedTo /* = 0 ~ 3 */) {
    editor.innerHTML = "<p id='p'>abc<br></p>";
    var p = document.getElementById("p");
    // FYI: We cannot inserting empty text nodes as expected with
    //      Node.appendChild() nor Node.insertBefore(). Therefore, let's use
    //      Range.insertNode() like actual web apps.
    var selection = window.getSelection();
    selection.collapse(p, 0);
    var range = selection.getRangeAt(0);
    var emptyTextNode1 = document.createTextNode("");
    range.insertNode(emptyTextNode1);
    var emptyTextNode2 = document.createTextNode("");
    range.insertNode(emptyTextNode2);
    var emptyTextNode3 = document.createTextNode("");
    range.insertNode(emptyTextNode3);
    is(p.childNodes.length, 5, "Failed to initialize the editor");
    is(p.childNodes.item(0), emptyTextNode3, "1st text node should be emptyTextNode3");
    is(p.childNodes.item(1), emptyTextNode2, "2nd text node should be emptyTextNode2");
    is(p.childNodes.item(2), emptyTextNode1, "3rd text node should be emptyTextNode1");
    switch (aSelectionCollapsedTo) {
      case 0:
        selection.collapse(p.childNodes.item(3), 0); // next to 'a'
        break;
      case 1:
        selection.collapse(emptyTextNode1, 0);
        break;
      case 2:
        selection.collapse(emptyTextNode2, 0);
        break;
      case 3:
        selection.collapse(emptyTextNode3, 0);
        break;
      default:
        ok(false, "aSelectionCollapsedTo is illegal value");
    }
  }

  for (var i = 0; i < 4; i++) {
    const kDescription = i == 0 ? "Delete from immediately before the first character" :
                                  "Delete from " + i + "th empty text node";
    editor.focus();
    initForDelete(i);
    synthesizeKey("KEY_Delete", { code: "Delete" });
    var p = document.getElementById("p");
    ok(p, kDescription + ": <p> element shouldn't be removed by Delete key press");
    is(p.tagName.toLowerCase(), "p", kDescription + ": <p> element shouldn't be removed by Delete key press");
    if (i == 0) {
      // If Delete key is pressed in non-empty text node, only the text node should be modified.
      // This is same behavior as Chromium, but different from Edge.  Edge removes all empty text nodes in this case.
      is(p.childNodes.length, 5, kDescription + ": <p> should have only 2 children after pressing Delete key (empty text nodes should be removed");
      is(p.childNodes.item(0).textContent, "", kDescription + ": 1st empty text node should not be removed by pressing Delete key");
      is(p.childNodes.item(1).textContent, "", kDescription + ": 2nd empty text node should not be removed by pressing Delete key");
      is(p.childNodes.item(2).textContent, "", kDescription + ": 3rd empty text node should not be removed by pressing Delete key");
      is(p.childNodes.item(3).textContent, "bc", kDescription + ": 'a' should be removed by pressing Delete key");
    } else {
      // If Delete key is pressed in an empty text node, it and following empty text nodes should be removed and the non-empty text node should be modified.
      // This is same behavior as Chromium, but different from Edge.  Edge removes all empty text nodes in this case.
      var expectedEmptyTextNodes = 3 - i;
      is(p.childNodes.length, expectedEmptyTextNodes + 2, kDescription + ": <p> should have only " + i + " children after pressing Delete key (" + i + " empty text nodes should be removed");
      is(p.childNodes.item(expectedEmptyTextNodes).textContent, "bc", kDescription + ": empty text nodes and 'a' should be removed by pressing Delete key");
    }
    editor.blur();
  }
  SimpleTest.finish();
});
</script>
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</html>
